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#include <fstream>
using namespace std;
ifstream f("fractal.in");
ofstream g("fractal.out");
int k, x, y, l;
int divimp(int x, int y, int ordin)
{
if (ordin<0)
return 0;
l=1<<ordin;
if (x<=l && y<=l)
return divimp(y, x, ordin-1);
if (x>l && y<=l)
return l*l + divimp(x-l, y, ordin-1);
if (y>l && x>l)
return 2*l*l + divimp(x-l, y-l, ordin-1);
return 3*l*l+divimp(2*l-y+1,l-x+1,ordin-1);
}
int main()
{
f>>k>>x>>y;
g<<divimp(x, y, k);
return 0;
}